Dynamic light scattering measurement method for flow velocity and particle size distribution of flowing aerosol
A technology of dynamic light scattering and particle size distribution, which is applied in the direction of fluid velocity measurement, velocity/acceleration/shock measurement, particle size analysis, etc., which can solve the difficulty of direct measurement of aerosol particle size distribution, limit the application of light scattering methods, and the inability of aerosol refractive index Accurate acquisition and other issues to achieve the effect of reducing application restrictions
Pending Publication Date: 2022-02-15
SHANDONG UNIV OF TECH
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Problems solved by technology
However, aerosol particle size distribution (PSD) is often difficult to measure directly
Especially in the flow state, the problem of online measurement of aerosol has not been well solved
In the light scattering method, except for the dynamic light scattering (DLS) method, other light scattering methods need to use the refractive index of aerosol particles as a known parameter when calculating the particle size, but in many cases, the measured aerosol The refractive index cannot be accurately obtained at the measurement site, which limits the application of the light scattering method in the industrial site
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[0042] Figure 1-22 It is the best embodiment of the present invention, below in conjunction with attached Figure 1-22 The present invention will be further described.
[0043] A method for measuring dynamic light scattering of flow velocity and particle size distribution of flowing aerosol, comprising a dynamic light scattering measurement device (hereinafter referred to as measuring device) of flow velocity and particle size distribution of flowing aerosol, such as figure 1As shown, the measuring device includes a test bench 8, an aerosol generator 9 is arranged under the test bench, and the outlet of the aerosol generator 9 is connected to the flow meter 10 through a pipeline and then connected to the aerosol pool 11. A cuvette placement platform 2 is arranged on the surface of the test bench 8, and a cuvette is fixed inside the cuvette placement platform 2. In this measuring device, a cuvette with two ends passing through is used. The outlet at the top of the aerosol po...
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The invention discloses a dynamic light scattering measurement method for flow velocity and particle size distribution of flowing aerosol, and belongs to the technical field of aerosol particle size distribution measurement. A measurement device is included and the method comprises the following steps: step 1, measuring to obtain a light intensity autocorrelation function of aerosol particles; step 2, obtaining a relational expression between the light intensity autocorrelation function and a normalized electric field autocorrelation function; step 3, obtaining a Maclaurin expansion of the logarithm of the light intensity autocorrelation function of the aerosol particles; step 4, calculating the flow velocity of the aerosol particles; step 5, obtaining an equation set containing aerosol particle size information distribution; and step 6, obtaining the particle size distribution of the aerosol particles. According to the dynamic light scattering measurement method for the flow velocity and the particle size distribution of the flowing aerosol, the particle flow velocity is obtained through the light intensity ACF so as to invert the particle size distribution of the aerosol, the measurement of the flow velocity and the particle size distribution in the aerosol transmission process can be realized without a field velocimeter, and the limitation of the light scattering method in industrial field application is greatly reduced.
Description
technical field [0001] The invention discloses a dynamic light scattering measurement method for flow velocity and particle size distribution of flowing aerosol, which belongs to the technical field of aerosol particle size distribution measurement. Background technique [0002] The particle size distribution (PSD) of aerosol particles is an important indicator of industrial emissions and an important parameter of their impact on the atmosphere. Whether it is the process monitoring of industrial production or the control of air pollution, the demand for aerosol particle size distribution (PSD) measurement is increasing day by day. However, aerosol particle size distribution (PSD) is often difficult to measure directly. Especially in the flow state, the problem of online measurement of aerosol has not been well resolved. At present, various measurement methods other than the light scattering method may destroy the original state of the sample, or require a large number of r...
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Login to View More IPC IPC(8): G01N15/02G01P5/22
CPCG01N15/0211G01P5/22
Inventor 申晋李鑫强牟彤彤刘伟王雅静王梦婕王钦
Owner SHANDONG UNIV OF TECH